From c486885ecda309759144ebad16ec4afd566e0bee Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Wed, 12 Aug 2020 19:13:56 -0400
Subject: prevent prepocessor comparisons against empty tokens

---
 re_comp.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 're_comp.h')

diff --git a/re_comp.h b/re_comp.h
index 9539cac..39df590 100644
--- a/re_comp.h
+++ b/re_comp.h
@@ -27,6 +27,11 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */
 
+#if defined _XOPEN_SOURCE && _XOPEN_SOURCE - 1 < 0
+#undef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 400
+#endif
+
 #if	(defined _XOPEN_SOURCE && ((defined _XOPEN_SOURCE_EXTENDED && _XOPEN_SOURCE_EXTENDED == 1) || 500 <= _XOPEN_SOURCE) && _XOPEN_SOURCE < 600)
 /* ./src/re_comp/re_comp.c */
 char *re_comp(const char *__string);
-- 
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